Wiktionary
struck gold
vb. (en-paststrike gold)
Usage examples of "struck gold".
Free wine was distributed to every household, while all men over the age of fifteen received a specially struck gold coin bearing the head of Philip, with Cleopatra's portrait on the reverse.
They struck gold when veteran clammer Wilbur Riley offered his services and showed our team the site where, during an effort to retrieve his tongs, which had caught and hung on a submerged object, he had pulled up artifacts from the Civil War era.
Harry looked up sharply, and the sunlight burning in from the walled garden struck gold from his bright, disconcerting eyes.